Sentrobe

The Sentrobe is an enemy in The Legend of Zelda: Skyward Sword. It will fly around just out of reach and attack you from long range. It is found in Lanayru Desert in places where a timeshift stone has been activated.

How to defeat

Wait for it to fire a missle at you, and then use a shield bash to bounce the missile into its "eye." It will send out 2 "Sentrobe Bombs." Slash both of them across their respective blue line, with a horizontal or a vertical slash. If not, they will explode. The Sentrobe will fire a missile again. Bounce it back with another shield bash, and it will be defeated.